Need to hide the identity of an informant in your video? Maybe doing a spot for COPS or the Discovery Channel? Well, this tutorial shows you how to create a mosaic blur effect to cover someone's face in Premiere.

With Premiere CS6 there is an even easier workflow for this (which doesn't require duplicating your footage). This is the best way I have found for blurring out faces, license plates and other sensitive information. Here's is the video explaining the process: